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Perrish Cox had two tackles and two pass breakups in a wild-card win at Green Bay. 9AP)

Perrish Cox is returning to the 49ers.

Again.

Cox, 27, who performed well in an emergency playoff role after he was released by the 49ers in November, has agreed to the terms on a one-year deal with the team, a league source confirmed.

Cox had an eventful 2013. He was released three times – twice by the Seahawks – and re-signed with the 49ers less than a week before a wild-card win at Green Bay. In a surprise move, Cox leapfrogged Eric Wright on the depth chart and served as the slot cornerback in the first two playoff games with Carlos Rogers sidelined by a hamstring injury.

Cox, who was targeted with seven passes, allowed three catches for 74 yards and quarterbacks had an 81.8 rating when throwing in his direction in 83 postseason snaps. His performance in high-stakes games bolsters his chances of making the 53-man roster, given the 49ers’ glaring need for a slot cornerback.

The other cornerbacks with NFL experience on the roster – Wright, Tramaine Brock, Chris Culliver, Chris Cook and Darryl Morris – played in the slot on fewer than four percent of their snaps in their last full season, according to Pro Football Focus. Rogers, who was released two weeks ago, has handled slot duties since 2011. Cox could battle Wright for a roster spot in training camp.

Before free agency, Cox was an unrestricted free agent, but the 49ers did not offer a $1.43 million tender. Cox will presumably receive a $645,000 base salary, the minimum for a player with three years of experience.

The 49ers are not expected to re-sign their two remaining unrestricted free agents: center Jonathan Goodwin and quarterback Colt McCoy.